rust/src/test/ui/consts/const-eval/const_let.rs

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fn main() {}
struct FakeNeedsDrop;
impl Drop for FakeNeedsDrop {
fn drop(&mut self) {}
}
// ok
const X: FakeNeedsDrop = { let x = FakeNeedsDrop; x };
// error
const Y: FakeNeedsDrop = { let mut x = FakeNeedsDrop; x = FakeNeedsDrop; x };
//~^ ERROR constant contains unimplemented expression type
// error
const Z: () = { let mut x = None; x = Some(FakeNeedsDrop); };
//~^ ERROR constant contains unimplemented expression type